Rsync data synchronization between two hard disks

Data synchronization between two hard disks of rsync has been unlucky recently. The svn server has been broken twice, and both hard disks have been broken, so there is no data.
Add two hard disks to the server and synchronize the data regularly every day. the system disk www.2cto.com is replaced by a SCSI disk, which is/dev/sdb, and a black disk is added as a backup. It is/dev/sda0 17 ***/bin/mount/dev/sda1/backup; /bin/date "+ \ % Y-\ % m-\ % d \ % H:
\ % M: \ % S ">/backup/time;/usr/bin/rsync-azP -- del/home/backup; /bin/umount/backup mount the backup hard disk at 5 o'clock every day, write the backup time, and then use rsync to synchronize data.